Section 12023.5 Of Article 2. Licensing From California Food And Agricultural Code >> Division 6. >> Chapter 6. >> Article 2.

. In addition to any other provision of this code, unprofessional conduct shall constitute a basis for refusal, revocation, or suspension of an agricultural pest control license. "Unprofessional conduct" means either of the following:
  (a) Repeated acts of recommending the clearly excessive use of a pesticide or any method or device for the control of plant, animal, or other pests.
  (b) Repeated acts of recommending the use of an ineffective pesticide or any ineffective method or device for the control of plant, animal, or any other pests.